0

Guest

Courses New

Ultraviolet light of wavelength 280 nm is used in an experiment on photoelectric effect with lithium ( = 2.5 eV) cathode. Find (a) the maximum kinetic energy of the photoelectrons and (b) the stopping potential.

Ultraviolet light of wavelength 280 nm is used in an experiment on photoelectric effect with lithium ( = 2.5 eV) cathode. Find
(a) the maximum kinetic energy of the photoelectrons and
(b) the stopping potential.

Grade:12

1 Answers

Arun
25758 Points
4 years ago
(a) K.E. = (hc / \lambda)  – \phi0
 = (1242 ev-nm/ 280 nm) – 2.5 ev
 = 1.9 ev
(b) stopping potential is given by
 ev = K.E.max
 V = 1.9 ev / e
 = 1.9 Volt

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

Other Related Questions on Wave Optics

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More